This study utilized 25 treebanks of 16 agglutinative languages spanning nine language families to investigate the correlation between morphological richness and word order flexibility. Morphological richness was measured at moving average morphological richness and moving average size of paradigms. Ordering flexibility was measured via cosine similarity and entropy. Statistical analysis revealed a significant positive correlation between morphological richness and word order flexibility, supporting the complexity trade-off hypothesis. Among the nine language families, it was found that Austronesian, Afro-Asiatic, and Dravidian languages exhibited lower diversity in both morphology and word order compared to Altaic, Indo-Aryan, and Uralic languages. Turkish, Uighur, Basque, and Northern Sami demonstrated the most balanced proportions of S, V, and O combinations. Within the same language family, a separation of morphology and word order was observed: the Finnic branch of the Uralic family displayed greater flexibility than the Finno-Ugric branch, and the Mongolic branch of the Altaic family exhibited stricter ordering compared to the Turkic branch. Further, by investigating the impact of language distance between L1 and L3 on language acquisition, the study concluded that languages characterized by increased word order flexibility in target languages are correlated with elevated levels of morphological richness in their native languages.